You better talk with someone from the the bank, like a branch manager or so if they refuse/don't understand what you're asking for.. they should be able to provide an official stamped statement!
Also, you are obligated to follow the bank rules for how they issue and release their official letters per purpose. That means if they issue "x" number of documents for each purpose (banks statement, account info. , balance certificate, etc..) just pay the charges and collect as per their format. CIC must be aware of the different bank policies in each country.